Chemistry A Molecular Approach 2nd Edition Tro Test Bank ... · Chemistry: A Molecular Approach, 2e (Tro) Chapter 2 Atoms and Elements Multiple Choice Questions 1) In a chemical reaction,

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Chemistry: A Molecular Approach, 2e (Tro)

Chapter 2 Atoms and Elements

Multiple Choice Questions

1) In a chemical reaction, matter is neither created or destroyed. Which law does this refer to?

A) Law of Definite Proportions

B) Law of the Conservation of Mass

C) Law of Modern Atomic Theory

D) Law of Multiple Proportions

E) First Law of Thermodynamics

Answer: B

Diff: 1 Page Ref: 2.3

2) All samples of a given compound, regardless of their source or how they were prepared, have

the same proportions of their constituent elements. Which law does this refer to?






Answer: A


3) When two elements form two different compounds, the masses of element B that combine

with 1 g of element A can be expressed as a ratio of small whole numbers. Which law does this

refer to?






Answer: D


4) Which of the following is an example of the law of multiple proportions?

A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.

B) Two different compounds formed from carbon and oxygen have the following mass ratios:

1.33 g O: 1 g C and 2.66 g O: 1 g C.

C) Two different samples of table salt are found to have the same ratio of sodium to chlorine.

D) The atomic mass of bromine is found to be 79.90 amu.

E) Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N.

Answer: B


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5) Which of the following statements is FALSE according to Dalton's Atomic Theory?

A) Atoms combine in simple whole number ratios to form compounds.

B) All atoms of chlorine have identical properties that distinguish them from other elements.

C) One carbon atom will combine with one oxygen atom to form a molecule of carbon

monoxide.

D) Atoms of sodium do not change into another element during chemical reaction with chlorine.

E) An atom of nitrogen can be broken down into smaller particles that will still have the unique

properties of nitrogen.

Answer: E


6) Identify the description of an atom.

A) neutrons and electrons in nucleus; protons in orbitals

B) neutrons in nucleus; protons and electrons in orbitals

C) protons and neutrons in nucleus; electrons in orbitals

D) protons and electrons in nucleus; neutrons in orbitals

E) electrons in nucleus; protons and neutrons in orbitals

Answer: C


7) Identify the charges of the protons, neutrons, and electrons.

A) protons +1, neutrons 0, electrons -1

B) protons 0, neutrons -1, electrons +1

C) protons -1, neutrons 0, electrons +1

D) protons 0, neutrons +1, electrons -1

E) protons +1, neutrons -1, electrons 0

Answer: A


8) Isotopes differ in the number of what particle?

A) beta particles

B) protons

C) electrons

D) neutrons

E) gamma particles

Answer: D


9) The mass number is equal to

A) the sum of the number of the electrons and protons.

B) the sum of the number of the neutrons and electrons.

C) the sum of the number of protons, neutrons, and electrons.

D) the sum of the number of protons and neutrons.

Answer: D







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10) Identify the element that has an atomic number of 40.

A) neon

B) calcium

C) zirconium

D) bromine

Answer: C


11) What does "X" represent in the following symbol?

8035X

A) mercury

B) chlorine

C) scandium

D) bromine

E) selenium

Answer: D


12) What does "X" represent in the following symbol? 2814X

A) silicon

B) sulfur

C) zinc

D) ruthenium

E) nickel

Answer: A


13) What does "X" represent in the following symbol? 23592X

A) tin

B) copper

C) palladium

D) niobium

E) uranium

Answer: E







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14) Determine the number of protons, neutrons and electrons in the following:

4018X

A) p+ = 18 n° = 18 e- = 22

B) p+ = 18 n° = 22 e- = 18

C) p+ = 22 n° = 18 e- = 18

D) p+ = 18 n° = 22 e- = 40

E) p+ = 40 n° = 22 e- = 18

Answer: B


15) Determine the number of protons, neutrons and electrons in the following:

2512X

A) p+ = 12 n° = 25 e- = 12

B) p+ = 12 n° = 12 e- = 13

C) p+ = 12 n° = 13 e- = 12

D) p+ = 25 n° = 12 e- = 13

E) p+ = 12 n° = 13 e- = 25

Answer: C


16) Determine the number of protons, neutrons and electrons in the following: 6529X

A) p+ = 36 n° = 29 e- = 36

B) p+ = 29 n° = 29 e- = 36

C) p+ = 36 n° = 36 e- = 29

D) p+ = 29 n° = 36 e- = 29

E) p+ = 29 n° = 36 e- = 36

Answer: D


17) What element is defined by the following information?

p+ = 11 n° = 12 e- = 11

A) sodium

B) vanadium

C) magnesium

D) titanium

Answer: A







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p+ = 20 n° = 20 e- = 20

A) zirconium

B) calcium

C) potassium

D) neon

E) argon

Answer: B



p+ = 17 n° = 20 e- = 17

A) calcium

B) rubidium

C) chlorine

D) neon

E) oxygen

Answer: C


20) How many electrons are in arsenic?

A) 33

B) 41

C) 42

D) 41.9

E) 75

Answer: A


21) How many neutrons are in arsenic?

A) 33

B) 41

C) 42

D) 41.9

E) 75

Answer: C


22) How many protons are in arsenic?

A) 33

B) 41

C) 42

D) 41.9

E) 75

Answer: A







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23) Which of the following statements about subatomic particles is TRUE?

A) A neutral atom contains the same number of protons and electrons.

B) Protons have about the same mass as electrons.

C) Electrons make up most of the mass of an atom.

D) Protons and neutrons have opposite, but equal in magnitude, charges.

E) Neutrons and electrons are found in the nucleus of an atom.

Answer: A


24) Isotopes differ in the number of

A) protons

B) neutrons

C) electrons

D) none of the above

E) all of the above

Answer: B


25) Which of the following statements about isotopes is TRUE?

A) Isotopes of the same element differ only in the number of electrons they contain.

B) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same

atom that contains fewer neutrons.

C) Isotopes of the same element have the same mass.

D) Isotopes of the same element don't usually have the same properties.

E) Some elements have 3 or more naturally occurring isotopes.

Answer: E


26) Give the symbol for fluorine.

A) F

B) Fl

C) Fo

D) Fu

E) Fr

Answer: A


27) Give the symbol for silver.

A) S

B) Si

C) Ar

D) Ag

E) Sl

Answer: D







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28) Identify a cation.

A) An atom that has lost an electron.

B) An atom that has gained an electron.

C) An atom that has lost a proton.

D) An atom that has gained a proton.

Answer: A


29) What species is represented by the following information?

p+ = 12 n° = 14 e- = 10

A) Si4+

B) Mg

C) Ne

D) Si

E) Mg2+

Answer: E



p+ = 47 n° = 62 e- = 46

A) Ag+

B) Nd

C) Pd

D) Ag

E) Pd+

Answer: A



p+ = 17 n° = 18 e- = 18

A) Cl

B) Cl-

C) Ar

D) Ar+

E) Kr

Answer: B







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32) Predict the charge that an aluminum ion would have.

A) 5-

B) 1+

C) 1-

D) 2+

E) 3+

Answer: E


33) Predict the charge that a calcium ion would have.

A) 6-

B) 2-

C) 3+

D) 2+

E) 1+

Answer: D


34) Predict the charge that an ion formed from sulfur would have.

A) 1-

B) 6+

C) 3-

D) 4+

E) 2-

Answer: E


35) Predict the charge that the ion formed from bromine would have.

A) 1-

B) 2+

C) 1+

D) 4+

E) 2-

Answer: A


36) Give the number of neutrons in P-3.

A) 18

B) 12

C) 19

D) 15

E) 16

Answer: E







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37) Give the number of electrons in P-3.

A) 18

B) 12

C) 19

D) 15

E) 16

Answer: A


38) Give the number of protons in P-3.

A) 18

B) 12

C) 19

D) 15

E) 16

Answer: D


39) Identify the largest atom or ion of carbon.

A) p+ = 6 n° = 6 e- = 6

B) p+ = 6 n° = 7 e- = 6

C) p+ = 6 n° = 6 e- = 7

D) p+ = 6 n° = 6 e- = 5

Answer: C


40) Which of the following elements is NOT a metal?

A) Ba

B) Mg

C) Xe

D) Pb

E) Ga

Answer: C


41) Which of the following elements is a metal?

A) As

B) C

C) I

D) Sn

E) Se

Answer: D







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42) Which of the following elements is a nonmetal?

A) Zn

B) Cs

C) Ca

D) Co

E) P

Answer: E


43) Which of the following elements is a noble gas?

A) Ar

B) Br

C) N

D) O

E) K

Answer: A


44) Which of the following elements is a halogen?

A) Ne

B) I

C) O

D) Mg

E) K

Answer: B


45) Which of the following elements is an alkaline earth metal?

A) Cs

B) Cu

C) Mg

D) Ti

E) Br

Answer: C


46) Which of the following elements is an alkali metal?

A) Zn

B) Xe

C) F

D) Li

E) Ca

Answer: D







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47) Which of the following elements is a metalloid?

A) Al

B) Ge

C) C

D) Sn

Answer: B


48) Which of the following is a transition element?

A) Pd

B) Sn

C) K

D) U

E) Pr

Answer: A


49) Which of the following statements is FALSE?

A) Halogens are very reactive elements.

B) The alkali metals are fairly unreactive.

C) Sulfur is a main group element.

D) Noble gases do not usually form ions.

E) Zn is a transition metal.

Answer: B


50) Which of the following does NOT describe a metal?

A) good conductor of heat

B) good conductor of electricity

C) tends to gain electrons

D) forms ionic compounds with nonmetals

E) found on the left side of the periodic table.

Answer: C


51) Which of the following does NOT describe a nonmetal?

A) tend to gain electrons

B) found in the upper right hand corner of the periodic table

C) poor conductor of electricity

D) nonmetals are generally unreactive

E) poor conductor of heat

Answer: D







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52) Semiconductors are

A) metalloids.

B) noble gases.

C) nonmetals.

D) metals.

Answer: A


53) Which of the following statements is FALSE?

A) Anions are usually larger than their corresponding atom.

B) Metals tend to form cations.

C) Atoms are usually larger than their corresponding cation.

D) The halogens tend to form 1+ ions.

E) Nonmetals tend to gain electrons.

Answer: D


54) The atomic mass for cadmium is

A) 48

B) 112.41

C) 40.08

D) 20

Answer: B


55) The atomic mass for tin is

A) 47.87

B) 50

C) 118.71

D) 22

Answer: C


56) The atomic number for tin is

A) 47.87

B) 50

C) 118.71

D) 22

Answer: B







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57) Calculate the atomic mass of silver if silver has 2 naturally occurring isotopes with the

following masses and natural abundances:

Ag-107 106.90509 amu 51.84%

Ag-109 108.90476 amu 48.46%

A) 107.90 amu

B) 108.00 amu

C) 107.79 amu

D) 108.32 amu

E) 108.19 amu

Answer: E


58) Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the


Ga-69 68.9256 amu 60.11%

Ga-71 70.9247 amu 39.89%

A) 69.72 amu

B) 69.93 amu

C) 70.00 amu

D) 69.80 amu

E) 70.68 amu

Answer: A


59) Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%.

What is the amu of the other isotope?

A) 106.905 amu

B) 106.908 amu

C) 106.903 amu

D) 106.911 amu

Answer: A


60) Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What is

the amu of the other isotope?

A) 70.924 amu

B) 70.928 amu

C) 70.932 amu

D) 70.920 amu

Answer: A







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61) Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the


X-45 44.8776 amu 32.88%

X-47 46.9443 amu 67.12%

A) 46.26 amu

B) 45.91 amu

C) 46.34 amu

D) 46.84 amu

E) 44.99 amu

Answer: A


62) Which of the following contains the MOST atoms? You shouldn't need to do a calculation

here.

A) 10.0 g Ne

B) 10.0 g He

C) 10.0 g Ar

D) 10.0 g Kr

E) 10.0 g Mg

Answer: B


63) Which of the following contains the FEWEST atoms? You shouldn't need to do a

calculation here.

A) 4.0 g Li

B) 4.0 g Na

C) 4.0 g Rb

D) 4.0 g K

E) 4.0 g Ca

Answer: C


64) How many silver atoms are contained in 3.75 moles of silver?

A) 6.23 × 1024 silver atoms

B) 2.26 × 1024 silver atoms

C) 1.61 × 1023 silver atoms

D) 2.44 × 1026 silver atoms

E) 6.50 × 1025 silver atoms

Answer: B







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65) How many xenon atoms are contained in 2.36 moles of xenon?

A) 3.92 × 1024 xenon atoms

B) 2.55 × 1023 xenon atoms

C) 1.42 × 1024 xenon atoms

D) 7.91 × 1025 xenon atoms

E) 1.87 × 1026 xenon atoms

Answer: C


66) How many argon atoms are contained in 7.66 x 105 mmol of argon?

A) 4.61 × 1026 Ar atoms

B) 1.84 × 1028 Ar atoms

C) 1.15 × 1028 Ar atoms

D) 7.86 × 1020 Ar atoms

E) 3.24 × 1026 Ar atoms

Answer: A


67) What mass (in g) does 3.99 moles of Kr have?

A) 334 g

B) 476 g

C) 211 g

D) 240 g

E) 144 g

Answer: A


68) How many moles of potassium are contained in 449 g of potassium?

A) 11.5 moles

B) 17.6 moles

C) 69.2 moles

D) 23.9 moles

E) 41.5 moles

Answer: A


69) How many moles are in 2.16 x 1024 atoms of lead?

A) 35.9 moles

B) 3.59 moles

C) 0.359 moles

D) 6.08 moles

E) 1.79 moles

Answer: B







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70) How many atoms are in 2.50 moles of CO2?

A) 4.52 x 1024 atoms

B) 1.52 x 1024 atoms

C) 5.02 x 1023 atoms

D) 3.01 x 1024 atoms

E) 7.53 x 1023 atoms

Answer: A


71) How many molecules are in 2.50 moles of CO2?

A) 4.52 x 1024 atoms

B) 1.51 x 1024 atoms

C) 5.02 x 1023 atoms

D) 3.01 x 1024 atoms

E) 7.53 x 1023 atoms

Answer: B


72) What mass (in kg) does 5.84 moles of titanium (Ti) have?

A) 0.352 kg

B) 0.122 kg

C) 0.820 kg

D) 0.280 kg

E) 0.632 kg

Answer: D


73) What mass (in mg) does 2.63 moles of nickel have?

A) 44.8 mg

B) 2.23 × 104 mg

C) 129 mg

D) 3.56 x 105 mg

E) 1.54 x 105 mg

Answer: E


74) How many moles of Kr are contained in 398 mg of Kr?

A) 4.75 × 10-3 moles Kr

B) 33.4 moles Kr

C) 2.11 × 10-4 moles Kr

D) 2.99 × 10-3 moles Kr

E) 1.19 × 10-4 moles Kr

Answer: A







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75) How many moles of Cs are contained in 595 kg of Cs?

A) 2.23 × 102 moles Cs

B) 4.48 × 103 moles Cs

C) 7.91 × 104 moles Cs

D) 1.26 × 103 moles Cs

E) 5.39 × 102 moles Cs

Answer: B


76) How many Li atoms are contained in 97.9 g of Li?

A) 5.90 × 1025 Li atoms

B) 7.09 × 1021 Li atoms

C) 8.49 × 1024 Li atoms

D) 4.27 × 1022 Li atoms

E) 4.18 × 1024 Li atoms

Answer: C


77) How many iron atoms are contained in 354 g of iron?

A) 2.62 × 1025 Fe atoms

B) 2.13 × 1026 Fe atoms

C) 4.69 × 1024 Fe atoms

D) 3.82 × 1024 Fe atoms

E) 9.50 × 1022 Fe atoms

Answer: D


78) How many phosphorus atoms are contained in 158 kg of phosphorus?

A) 3.07 × 1027 phosphorus atoms

B) 2.95 × 1027 phosphorus atoms

C) 3.25 × 1028 phosphorus atoms

D) 1.18 × 1024 phosphorus atoms

E) 8.47 × 1024 phosphorus atoms

Answer: A


79) Calculate the mass (in g) of 1.9 x 1024 atoms of Pb.

A) 3.9 × 102 g

B) 2.4 × 102 g

C) 3.2 × 102 g

D) 1.5 × 102 g

E) 6.5 × 102 g

Answer: E







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80) Calculate the mass (in kg) of 4.87 x 1025 atoms of Zn.

A) 5.29 kg

B) 1.89 kg

C) 8.09 kg

D) 1.24 kg

E) 1.09 kg

Answer: A


81) Calculate the mass (in ng) of 2.33 x 1020 atoms of oxygen.

A) 6.19 × 106 ng

B) 1.62 × 107 ng

C) 2.25 × 103 ng

D) 3.73 × 106 ng

E) 4.69 × 107 ng

Answer: A


Algorithmic Questions

1) An atom of 14C contains __________ protons.

A) 6

B) 20

C) 8

D) 10

E) 14

Answer: A


2) An atom of 131Xe contains __________ electrons.

A) 131

B) 185

C) 77

D) 123

E) 54

Answer: E


3) The atomic number of an atom of 80Br is __________.

A) 115

B) 35

C) 45

D) 73

E) 80

Answer: B







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4) An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is __________.

A) 17O2-

B) 17O2+

C) 19F+

D) 19F-

E) 17Ne2+

Answer: A


5) How many electrons does the Al3+ ion possess?

A) 16

B) 10

C) 6

D) 0

E) 13

Answer: B


6) How many protons does the Br- ion possess?

A) 34

B) 36

C) 6

D) 8

E) 35

Answer: E


7) Predict the charge of the most stable ion of bromine.

A) 2+

B) 1+

C) 3+

D) 1-

E) 2-

Answer: D


8) Predict the charge of the most stable ion of potassium.

A) 3+

B) 1-

C) 2+

D) 2-

E) 1+

Answer: E







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9) What is the chemical symbol for titanium?

A) Th

B) Ti

C) Tl

D) Tm

Answer: B


10) What is the chemical symbol for mercury?

A) Ag

B) Au

C) Hg

D) Pb

Answer: C


11) What is the chemical symbol for copper?

A) Co

B) Cr

C) Cu

D) C

Answer: C


12) Which element has the chemical symbol, Ru?

A) rubidium

B) ruthenium

C) rutherfordium

D) rhodium

Answer: B


13) Which element has the chemical symbol, S?

A) selenium

B) silicon

C) sulfur

D) scandium

Answer: C


14) Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is

an isotope of an atom that has

A) an atomic number of 21 and a mass number of 42.

B) an atomic number of 20 and a mass number of 40.

C) 22 neutrons and 20 protons.

D) 22 protons and 20 neutrons.

Answer: B







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15) Which of the following represent isotopes?

A: 3215X B: 32

16X C: 3115X D: 34

17 X

A) A and B

B) A and C

C) A and D

D) C and D

Answer: B


16) How many protons (p) and neutrons (n) are in an atom of 9038Sr ?

A) 38 p, 52 n

B) 38 p, 90 n

C) 52 p, 38 n

D) 90 p, 38 n

Answer: A


17) How many protons (p) and neutrons (n) are in an atom of barium-130?

A) 56 p, 74 n

B) 56 p, 130 n

C) 74 p, 56 n

D) 130 p, 56 n

Answer: A


18) What is the element symbol for an atom that has 5 protons and 6 neutrons?

A) B

B) C

C) H

D) Na

Answer: A


19) How many electrons are in a neutral atom of bromine-81?

A) 1

B) 35

C) 36

D) 81

Answer: B







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20) Identify the chemical symbol of element Q in 8034Q .

A) Br

B) Hg

C) Pd

D) Se

Answer: D


21) An atom of 118Xe contains __________ neutrons.

A) 54

B) 172

C) 64

D) 110

E) 118

Answer: C


22) The mass number of an atom of 128Xe is __________.

A) 54

B) 182

C) 74

D) 128

E) 120

Answer: D


23) What is the identity of element Q if the ion Q2+ contains 10 electrons?

A) C

B) O

C) Ne

D) Mg

Answer: D


24) How many electrons are in the ion, Cu2+?

A) 27

B) 29

C) 31

D) 64

Answer: A







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25) How many electrons are in the ion, P3-?

A) 12

B) 18

C) 28

D) 34

Answer: B


26) In which of the following sets do all species have the same number of electrons?

A) F-, Ne, Mg2+

B) Ge, Se2-, Br-

C) K+, Rb+, Cs+

D) Br, Br-, Br+

Answer: A


27) In which of the following sets do all species have the same number of protons?

A) F-, Ne, Mg2+

B) Ge, Se2-, Br-

C) K+, Rb+, Cs+

D) Br, Br-, Br+

Answer: D


28) Cesium belongs to the __________ group of the periodic table.

A) alkali metal

B) alkaline earth metal

C) halogen

D) noble gas

Answer: A


29) Iodine belongs to the __________ group of the periodic table.

A) alkali metal


C) halogen

D) noble gas

Answer: C


30) Argon belongs to the __________ group of the periodic table.

A) alkali metal


C) halogen

D) noble gas

Answer: D







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31) Barium belongs to the __________ group of the periodic table.

A) alkali metal


C) halogen

D) noble gas

Answer: B


32) Which of the following elements has chemical properties similar to tellurium?

A) fluorine

B) hydrogen

C) nitrogen

D) sulfur

Answer: D


33) Which of the following elements is a gas at room temperature?

A) bromine

B) carbon

C) helium

D) sodium

Answer: C


34) Which of the following elements is not a solid at room temperature?

A) Ag

B) Al

C) Xe

D) Fe

Answer: C


35) Which of the following elements is classified as a semimetal?

A) calcium

B) boron

C) fluorine

D) uranium

Answer: B


36) Which of the following elements is a good conductor of heat and electricity?

A) carbon

B) chlorine

C) neon

D) aluminum

Answer: D







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37) Which one of the following elements is a poor conductor of heat and electricity?

A) copper

B) fluorine

C) iron

D) lead

Answer: B


38) All of the following elements are nonmetals except

A) barium.

B) carbon.

C) hydrogen.

D) oxygen.

Answer: A


Matching Questions

Match the following.

A) C

B) Mg

C) Fe

D) K

E) Si

1) magnesium


2) carbon


3) potassium


4) iron


5) silicon


Answers: 1) B 2) A 3) D 4) C 5) E






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Short Answer Questions

1) Describe an atom and what it is made up of according to modern atomic theory.

Answer: An atom is made up of a nucleus surrounded by electrons. The nucleus contains

protons (positively charged particles) and neutrons (neutral particles) and is where most of the

mass of an atom comes from, but is a tiny fraction of an atom's volume. The nucleus is

surrounded by negatively charged electrons, the same number as there are protons in the nucleus.

An atom is therefore neutral overall.


2) The atomic number is equal to the number of

Answer: protons


3) Why do the isotopes of the same element have the same atomic size?

Answer: Isotopes only differ in the number of neutrons contained within the nucleus. Since the

size of an atom is determined by the electrons, isotopes of the same element should be the same

size.


4) Why doesn't a mass spectrum of silver have a peak at 107.9 amu?

Answer: The average atomic mass of silver is 107.9 amu, but there are no atoms of silver that

weigh 107.9 amu. One isotope weighs more and another weighs less.


5) Are anions typically larger or smaller than their corresponding atom? Why?

Answer: Anions are larger than their corresponding atom because the anion contains more

electrons than the atom. Since electrons repel one another AND determine the size of the atom

or ion, adding electrons to the atom to form an anion makes it larger.


6) Give the name of the element whose symbol is Na.

Answer: sodium


7) Describe the difference between ions and isotopes.

Answer: Ions have the loss or gain of electrons; isotopes differ in the number of neutrons.


8) Give an example of an halogen.

Answer: F, Br, I, or Cl


9) What group of elements in the periodic table are the most unreactive and why?

Answer: The noble gases are the most unreactive since they do not combine with other elements

to form compounds.







27


10) Why do elements in the same group tend to have similar chemical properties?

Answer: Since elements in the same group have the same number of valence electrons (similar

electron configurations) they tend to have similar chemical reactivity, since chemical reactions

typically involve valence electrons.


11) Give the name of the instrument that is used to measure masses of atoms and the percent

abundance of isotopes.

Answer: mass spectrometer


12) The number, 6.022 x 1023 is called ________.

Answer: Avogadro's number







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Chemistry A Molecular Approach 2nd Edition Tro Test Bank ... · Chemistry: A Molecular Approach, 2e (Tro) Chapter 2 Atoms and Elements Multiple Choice Questions 1) In a chemical reaction,